CN104657008A - Touch sensing device and operation method thereof - Google Patents

Abstract

The present invention provides a touch sensing device and an operating method thereof. The touch sensing device includes a plurality of driving lines, a plurality of sensing lines intersecting the plurality of driving lines, a driving unit, a sensing unit, and a demodulation unit. The driving unit simultaneously drives multiple groups of driving lines in multiple driving cycles, and the driving unit provides driving voltages of different strengths and/or different phases to the multiple driving lines in each driving cycle. The sensing unit receives the total capacitance of each sensing line. The demodulation unit calculates the inductive capacitance of each inductive capacitor based on the total capacitance and the driving voltage. This causes external noise that interferes with the sensing capacitor to be dispersed to multiple sensing capacitors, reducing the impact of external signals on a single sensing capacitor and improving the accuracy of the sensing capacitance of each sensing capacitor.

Description

Touch sensing device and method of operation thereof

technical field

The present invention provides a touch sensing device and its operating method, and in particular relates to a touch sensing device and its operating method for improving touch accuracy.

Background technique

In recent years, more and more people use touch electronic devices. It utilizes the touch panel on the electronic device, so that the user can achieve the purpose of controlling the electronic device by pressing the touch panel.

In general, a touch-sensitive electronic device includes a driving unit, a detection circuit, a plurality of driving lines and a plurality of sensing lines. A touch panel of the electronic device is provided with a plurality of driving lines and a plurality of sensing lines respectively intersecting, and a mutual capacitance is provided at the intersection of each driving line and each sensing line. The driving unit sequentially outputs driving voltages to a plurality of driving lines, so that the corresponding capacitors generate inductive capacitances. And the detection circuit will detect the sensing capacitance on each sensing line.

When the user presses a certain touch position of the touch panel, the inductive capacitance of the capacitor corresponding to the touch position will change. At this time, the detection circuit will detect that the inductive capacitance of the capacitor corresponding to the touch position has changed, so as to know the touch position pressed by the user.

However, in addition to detecting the inductive capacitance, the detection circuit also detects external noise (such as temperature, humidity, electromagnetic interference, static electricity, transformer noise or display noise, etc.), which makes the signal detected by the detection circuit unstable, resulting in touch The effect is not good, so how to improve the detected inductive capacitance and accuracy is really important.

Contents of the invention

The purpose of the present invention is to provide a touch sensing device and its operation method, through which the drive unit simultaneously drives a plurality of drive lines in multiple drive cycles, and the drive unit provides different intensities and/or different signals in each drive cycle. Phase drive voltage to the above multiple drive lines. The external noise that interferes with the sensing capacitor is dispersed to multiple sensing capacitors, thereby reducing the influence of external signals on a single sensing capacitor and improving the accuracy of the sensing capacitance of each sensing capacitor.

In one embodiment of the present invention, the touch sensing device includes a plurality of driving lines, a plurality of sensing lines, a driving unit, a sensing unit, and a demodulation unit. Multiple driving lines are arranged in parallel in sequence. The driving lines are divided into at least one group. Each group has a plurality of group driving lines formed by dividing the driving lines equally. A plurality of sensing lines and a plurality of driving lines are sequentially intersected. The intersection of each driving line and each sensing line is correspondingly provided with a sensing capacitor. One end of the sensing capacitor is electrically connected to the corresponding driving line, and the other end of the sensing capacitor is electrically connected to the corresponding sensing line. The driving unit is electrically connected to a plurality of driving lines. The driving unit simultaneously drives multiple group driving lines of the same group according to the order of the groups and drives multiple driving periods in the same group. In addition, the driving unit provides driving voltages of different strengths to the driving lines of a plurality of groups in each driving period of the same group, and generates sensing capacitances in corresponding sensing capacitances. The number of the multiple group driving lines is the same as the number of the multiple driving cycles. The sensing unit is electrically connected to a plurality of sensing lines. The sensing unit receives the total capacitance of the sum of the multiple sensing capacitances generated by the multiple sensing capacitances corresponding to each sensing line. The demodulation unit is electrically connected to the sensing unit. The demodulation unit calculates each group of the same group on each sensing line according to the total capacitance and driving voltage generated by each driving cycle of the same group sensed by each sensing line. The sensing capacitance of the sensing capacitor corresponding to the driving line. When the user presses a certain touch position on the touch surface of the touch sensing device, the demodulation unit will detect that the sensing capacitance of the sensing capacitor corresponding to the touch position has changed. Based on this, the demodulation unit can know the touch position of the user pressing the touch surface, so as to further control the electronic device.

In one embodiment of the present invention, the touch sensing device includes a plurality of driving lines and a plurality of sensing lines. Multiple driving lines are arranged in parallel in sequence. The driving lines are divided into at least one group. Each group has a plurality of group driving lines formed by dividing the driving lines equally. A plurality of sensing lines and a plurality of driving lines are sequentially intersected. A sensing capacitor is correspondingly arranged at a crossing of each driving line and each sensing line. One end of the sensing capacitor is electrically connected to the corresponding driving line. The other end of the sensing capacitor is electrically connected to the corresponding sensing line. The above-mentioned operation method for improving the touch accuracy of the touch sensing device includes the following steps: Step (A) Simultaneously drive multiple group drive lines of the same group according to the order of the groups and drive multiple drive lines in the same group cycle, and in each driving cycle of the same group, respectively provide driving voltages with different strengths to the driving lines of a plurality of groups, and respectively generate sensing capacitances in corresponding sensing capacitances. The number of the multiple group driving lines is the same as the number of the multiple driving cycles. In step (B), each sensing line receives a total capacitance of a plurality of sensing capacitances generated by corresponding sensing capacitances. Step (C) According to the driving voltage and total capacitance of each driving cycle of the same group sensed by each sensing line, calculate each group of driving lines of the same group on each sensing line The inductive capacitance of the corresponding inductive capacitor. Step (D) judging whether the sensing capacitance of each sensing capacitor has changed, and transmitting the touch position corresponding to the sensing capacitor whose sensing capacitance has changed to the back-end processing unit for analysis. Therefore, when the user presses a certain touch position on the touch surface of the touch sensing device, the demodulation unit will detect that the sensing capacitance of the sensing capacitor corresponding to the touch position has changed. Based on this, the demodulation unit knows the touch position of the user pressing the touch surface, and transmits the touch position to the back-end processing unit for analysis, so as to further control the electronic device.

In order to enable a further understanding of the features and technical content of the present invention, please refer to the following detailed description and accompanying drawings of the present invention, but these descriptions and accompanying drawings are only used to illustrate the present invention, rather than claiming the rights of the present invention Any limitations on the scope are required.

Description of drawings

FIG. 1 is a schematic diagram of a touch sensing device according to an embodiment of the present invention.

FIG. 2 is a schematic diagram of part of the touch sensing device in FIG. 1 .

FIG. 3 is a timing diagram of a driving unit driving multiple group driving lines of the same group according to an embodiment of the present invention.

FIG. 4 is a flow chart of the operation method of the touch sensing device according to an embodiment of the present invention.

FIG. 5 is a schematic diagram of a touch surface where a user presses a touch sensing device according to an embodiment of the present invention.

【Symbol Description】

50: Touch the surface

100: Touch sensing device

110: drive unit

120: sensing unit

122: Analog front-end components

124: Analog-to-digital conversion components

130: demodulation unit

C1-C16: Sensing capacitance

C36, C37, C38, C46, C47, C48, C56, C57, C58: sensing capacitance

GP1-GP4: Group

Rx1-Rx18: Sensing lines

T1-T4: drive cycle

Tch: touch position

Tx1-Tx16: drive line

Txg1-Txg16: group drive lines

V11, V12, V13, V14, V21, V22, V23, V24, V31, V32, V33, V34, V41, V42, V43, V44: drive voltage

S410, S420, S430, S440: steps

Detailed ways

First, refer to Figure 1. FIG. 1 is a schematic diagram of a touch sensing device according to an embodiment of the present invention. As shown in FIG. 1 , the touch sensing device 100 includes driving lines Tx1 - Tx16 , sensing lines Rx1 - Rx18 , a driving unit 110 , a sensing unit 120 , and a demodulation unit 130 . The driving lines Tx1 - Tx16 and the sensing lines Rx1 - Rx18 are disposed on the touch surface 50 . When the user presses a certain touch position on the touch surface 50 , the demodulation unit 130 can know the touch position on the touch surface 50 pressed by the user.

The driving lines Tx1-Tx16 are sequentially arranged in parallel and equally divided into groups GP1-GP4. And each group GP1-GP4 has a plurality of group driving lines formed by equally dividing the driving lines Tx1-Tx16. Here, the group GP1 corresponds to the group driving lines Txg1-Txg4. The group GP2 corresponds to the group driving lines Txg5-Txg8. The group GP3 corresponds to the group driving lines Txg9-Txg12. The group GP4 corresponds to the group driving lines Txg13-Txg16. In this embodiment, there are 16 driving lines in total, 4 groups in total, and 4 driving lines in groups. But in practice, the driving lines, the groups, and the group driving lines can also be other numbers. For example, there are 30 driving lines in total, 10 groups in total in groups, and 3 driving lines in groups. The number of driving lines, groups, and group driving lines only needs to be consistent with multiple driving lines being divided into multiple groups and each group has multiple driving lines formed by multiple driving lines being equally divided. That is, the present invention is not limited thereto.

The sensing lines Rx1-Rx18 and the driving lines Tx1-Tx16 are sequentially intersected. A sensing capacitor (not shown in FIG. 1 ) is correspondingly provided at the intersection of each driving line Tx1 - Tx16 and each sensing line Rx1 - Rx18 . One end of the sensing capacitor is electrically connected to the corresponding driving line, and the other end of the sensing capacitor is electrically connected to the corresponding sensing line. In order to further illustrate the connection relationship among the sensing lines, the driving lines, and the sensing capacitors, the connection relationship among the driving lines Tx1-Tx16, the sensing line Rx1, and the sensing capacitors C1-C16 will be explained below. As shown in FIG. 2 , sensing capacitors C1 - C16 are correspondingly arranged at intersections of the driving lines Tx1 - Tx16 and the sensing line Rx1 . One end of the sensing capacitors C1-C16 is electrically connected to the corresponding driving lines Tx1-Tx16, and the other end of the sensing capacitors C1-C16 is electrically connected to the corresponding sensing line Rx1. In this embodiment, the sensing lines Rx1-Rx18 and the driving lines Tx1-Tx16 are vertically intersecting in sequence. In practice, the sensing lines Rx1 - Rx18 and the driving lines Tx1 - Tx16 can also be set at other crossing angles. It is sufficient that the crossing relationship between each of the sensing lines Rx1 - Rx18 and each of the driving lines Tx1 - Tx16 is consistent, and the present invention is not limited thereto. In addition, there are 18 sensing lines in this embodiment. However, in practice, the number of sensing lines can also be other numbers, for example, there are 32 sensing lines, which is not limited in the present invention.

The driving unit 110 is electrically connected to the driving lines Tx1-Tx16, and the sensing unit 120 is electrically connected to the sensing lines Rx1-Rx18. The driving unit 110 simultaneously drives the group driving lines of the same group according to the order of the groups GP1-GP4, that is, the driving unit 110 sequentially drives the group driving lines Txg1-Txg4 of the group GP1, and drives the group driving lines of the group GP2. Lines Txg5-Txg8, group driving lines Txg9-Txg12 driving group GP3, and group driving lines Txg13-Txg16 driving group GP4, and drive multiple driving cycles in the same group (such as the driving cycle of Figure 3 T1-T4). The driving unit 110 provides driving voltages of different strengths to the group driving lines in each driving period of the same group (such as the driving voltages V11, V12, V13, V14, V21, V22, V23, V24, V31 of FIG. 3 ). ,V32,V33,V34,V41,V42,V43,V44). In this embodiment, the intensity voltage value of the driving voltage is between 5-20 volts, and the driving period is between 100-500 microseconds (μs). In addition, the driving unit 110 can also provide driving voltages of different phases, or driving voltages of different strengths and different phases to the group driving lines (not shown in FIG. 3 ) in each driving period of the same group. There is no limit to this. Then the sensing capacitors corresponding to the group driving lines will respectively generate sensing capacitors (such as sensing capacitors C1 - C4 in FIG. 2 ). Here, the number of group driving lines is the same as the number of driving periods, for example, the number of group driving lines Txg1 - Txg4 in FIG. 2 and the number of driving periods T1 - T4 in FIG. 3 are both four. Through the driving unit 110 driving the driving lines Tx1-Tx16, the external noise (such as temperature, humidity, electromagnetic interference, static electricity, etc.) Capacitors C1-C4 are used to prevent external noise from directly affecting a single sensing capacitor, thereby improving the accuracy of sensing capacitance of each sensing capacitor.

Next, each sensing line Rx1-Rx18 will respectively receive the total capacitance of multiple sensing capacitances generated by the corresponding multiple sensing capacitances, as shown in Figure 2, the sensing line Rx1 respectively in the driving period T1 of Figure 3 - The total capacitance of the sum of the inductive capacitances generated by the inductive capacitances C1-C16 received in T4.

In addition, please refer to FIG. 2 at the same time, the sensing unit 120 includes a plurality of analog front end elements 122 (analog front end, AFE) and a plurality of analog to digital conversion elements 124 (analog to digital, ADC). Each analog front-end component 122 is correspondingly connected to each sensing line Rx1-Rx18, so as to respectively receive the total capacitance after the sum of multiple inductive capacitances generated by corresponding multiple inductive capacitors, as shown in FIG. The sensing line Rx1 is connected, and the analog front-end element 122 respectively receives the total capacitance of the sum of the sensing capacitances generated by the sensing capacitors C1-C16 in the driving periods T1-T4 of FIG. 3 . The analog front-end elements 122 are respectively connected to a plurality of analog-to-digital conversion elements 124 to respectively convert the received total capacitance into a digital signal format, and transmit the total capacitance in digital form to the demodulation unit 130 .

The demodulation unit 130 is electrically connected to the sensing unit 120 . The demodulation unit 130 will calculate the total capacitance and the driving voltage generated by each driving cycle of the same group sensed by each sensing line to calculate each of the same group on each sensing line. The inductive capacitance of the inductive capacitance corresponding to a group of driving lines, the demodulation unit 130 of FIG. capacitance. Therefore, when a user presses a certain touch position on the touch surface, the demodulation unit 130 will detect that the inductive capacitance of the inductive capacitance corresponding to the above touch position has changed and that the inductive capacitance corresponding to other positions on the touch surface has changed. The inductive capacitance does not change. Based on this, the demodulation unit 130 can know the touch position where the user presses the touch surface.

Next, please also refer to Figure 4. FIG. 4 is a flow chart of the operation method of the touch sensing device according to an embodiment of the present invention. First, the drive unit 110 simultaneously drives multiple group drive lines of the same group according to the order of the groups GP1-GP4, that is, the drive unit 110 sequentially drives the group drive lines Txg1-Txg4 of the group GP1, drives the group GP2 The group driving lines Txg5-Txg8 for driving the group GP3, the group driving lines Txg9-Txg12 for driving the group GP3, and the group driving lines Txg13-Txg16 for driving the group GP4. And the driving unit 110 drives multiple driving periods in the same group, for example, the driving unit 110 drives the four driving periods T1-T4 in FIG. 3 in the group GP1. In addition, the driving unit 110 provides driving voltages of different strengths to the driving lines of a plurality of groups in each driving period of the same group. For example, the driving unit 110 respectively provides the driving voltages V11, V12, V13, V14 of FIG. 3 to the group driving lines Txg1-Txg4 in the driving period T1 of the group GP1, and provides the driving voltages of FIG. 3 in the driving period T2 of the group GP1. V21, V22, V23, V24 to the group drive lines Txg1-Txg4, respectively provide the drive voltages V31, V32, V33, V34 in Figure 3 to the group drive lines Txg1-Txg4, and to the group GP1 in the drive period T3 The driving period T4 of the group GP1 provides the driving voltages V41 , V42 , V43 , V44 of FIG. 3 to the group driving lines Txg1 - Txg4 respectively. Wherein the number of multiple group driving lines is the same as the number of multiple driving cycles, for example, the number of group driving lines Txg1-Txg4 in Figure 2 and the number of driving cycles T1-T4 in Figure 3 are 4, and respectively in the corresponding induction The capacitor generates an inductive capacitance (step S410 ). From the way the driving unit 110 drives the driving lines Tx1-Tx16, it can be seen that the external noise that interferes with the sensing capacitor will be dispersed to multiple sensing capacitors (such as the external noise is dispersed to the sensing capacitors C1-C4 in Figure 2), so as to avoid the external noise from directly affecting the single sensing capacitor. One sensing capacitor, thereby improving the accuracy of the sensing capacitance of each sensing capacitor.

Next, each sensing line receives the total capacitance of the sum of the sensing capacitances generated by the corresponding multiple sensing capacitors. As shown in FIG. 1 , the sensing lines Rx1 - Rx18 in each driving cycle receive the total capacitance of the sum of the sensing capacitances generated by the corresponding plurality of sensing capacitances. Then each sensing line filters out the noise of the total capacitance, and converts the total capacitance into a digital signal format, so as to transmit the digital total capacitance to the demodulation unit 130 for further analysis (step S420 ).

Next, the demodulation unit 130 calculates each group of the same group on each sensing line according to the driving voltage and the total capacitance of each driving cycle of the same group sensed by each sensing line. The sensing capacitance of the sensing capacitor corresponding to the driving line (step S430 ). For example, the demodulation unit 130 according to the driving voltages V11, V12, V13, V14, V21, V22, V23, V24, V31, V32, V33, V34, V41, V42, V43, V44 and induction The total capacitance of the capacitances C1-C4 generated during the driving periods T1-T4 is summed to calculate the capacitance of the capacitances C1-C4.

Here, the demodulation unit 130 uses Cramer's Rule to calculate the sensing capacitance of the sensing capacitor corresponding to each group of driving lines of the same group on each sensing line. The Kramer operation looks like this:

Among them, S _T1 ... S _Tn is the total capacitance generated by the sensing capacitance of the same group sensed by the same sensing line in each driving cycle, as shown in Fig. The total capacitance generated by the capacitors C1-C4 during the driving period T1-T4 in FIG. 3 . [V ₁₁ ˜V _1n ], [V ₂₁ ˜V _2n ], . . . [V _n1 ˜V _nn ] are driving voltages provided by the driving unit 110 to the driving lines of a plurality of groups in each driving period of the same group. As shown in Figure 2, the driving unit 110 provides driving voltages V11, V12, V13, and V14 of different intensities to the group driving lines Txg1-Txg4 in the driving period T1 of the group GP1, and respectively provides them in the driving period T2 of the group GP1. Drive voltages V21, V22, V23, V24 of different intensities to the group drive lines Txg1-Txg4, respectively provide drive voltages V31, V32, V33, V34 of different intensities to the group drive lines Txg1 in the drive period T3 of the group GP1 - Txg4, and respectively provide driving voltages V41, V42, V43, V44 of different intensities to the group driving lines Txg1-Txg4 in the driving period T4 of the group GP1. C ₁ ... C _n is the inductive capacitance of multiple group drive lines of the same group sensed by the same sensing line, as shown in Figure 2, the sensing capacitance C1-C4 of the group GP1 is sensed by the sensing line Rx1 Inductive capacitance.

In addition, in this embodiment, the driving voltage is composed of multiple identical pulse voltages, for example, the driving voltage of the group driving line Txg1 in the driving period T1 of FIG. 3 is composed of 4 pulse voltages. Therefore, each sensing line can first select a better pulse voltage as the driving voltage among multiple pulse voltages. For example, the sensing line Rx1 selects the second pulse voltage as the driving cycle T1 in the driving cycle T1 of FIG. 3 The voltage is provided to the demodulation unit 130 for analysis. Or each sensing line can sense a plurality of capacitance sums in the same driving cycle, and then the demodulation unit 130 averages the plurality of capacitance sums to generate the total capacitance. If the sensing line Rx1 senses the sum of 4 capacitances in the driving period T1 of FIG. 3 , then the demodulation unit 130 averages the sum of the 4 capacitances to generate the total capacitance. Therefore, the driving voltage is composed of multiple identical pulse voltages, which can further reduce the problem of the driving unit 110 providing an unstable driving voltage, so that the demodulation unit 130 can obtain a more accurate total capacitance. Of course, the driving voltage can also be composed of a pulse voltage, or the driving voltage can be continuously output, which is not limited in the present invention. In addition, the pulse voltage in this embodiment may be a square wave, a sine wave, a triangle wave, or other types of waveforms, which is not limited by the present invention.

After step S430, the demodulation unit 130 can further detect whether the sensing capacitance of each sensing capacitor arranged on the driving lines Tx1-Tx16 and the sensing lines Rx1-Rx18 has changed, and sense the change of the sensing capacitance. The touch position corresponding to the capacitor is sent to the back-end processing unit (not shown) for analysis (step S440 ). Therefore, when a user presses a certain touch position on the touch surface, the demodulation unit 130 will detect that the sensing capacitance of the sensing capacitor corresponding to the touch position has changed and that the sensing capacitance corresponding to other positions on the touch surface There is no change in the inductive capacitance, and then the demodulation unit 130 sends the touch position to the back-end processing unit for further analysis, so that the back-end processing unit can know the touch position of the user pressing the touch surface, and further control the back-end processing unit. terminal electronic devices.

In order to further illustrate that the driving unit 110 drives the driving lines Tx1-Tx16, the sensing unit 120 senses the total capacitance received by each sensing line Rx1-Rx18 in each driving cycle, and the demodulation unit 130 calculates each sensing The case of the inductive capacitance of a capacitor. Please refer to FIG. 2 and FIG. 3 at the same time. The following will illustrate that the driving unit 110 simultaneously drives the group driving lines Txg1-Txg4 of the group GP1, and the driving unit 110 outputs different intensities of driving in the driving periods T1-T4 of the group GP1. Voltages V11, V12, V13, V14, V21, V22, V23, V24, V31, V32, V33, V34, V41, V42, V43, V44 to the drive line Tx1-Tx4, and the sense line Rx1 respectively in the drive cycle T1-T4 The total capacitance of the sum of the induced capacitances corresponding to the induction capacitances C1-C4 is received, and the demodulation unit 130 calculates the induction capacitances of the induction capacitances C1-C4 respectively.

Please refer to Figure 2 and Figure 3 at the same time. The driving unit 110 simultaneously drives the group driving lines Txg1-Txg4 in the group GP1. Since there are 4 group driving lines in this embodiment, the driving period is set to 4 time periods, that is, the driving period in FIG. 3 is T1-T4. Next, the driving unit 110 will drive the group driving lines Txg1-Txg4 of the group GP1 for 4 driving periods T1-T4, and provide driving voltages of different strengths to the group driving lines Txg1-Txg4 in each driving period, as shown in the figure 3. That is to say, the driving unit 110 respectively outputs the driving voltages V11, V12, V13, V14 to the group driving lines Txg1-Txg4 in the driving period T1, and outputs the driving voltages V21, V22, V23, V24 respectively to the group driving lines in the driving period T2. Lines Txg1-Txg4, output drive voltages V31, V32, V33, V34 to the group drive lines Txg1-Txg4 in the drive cycle T3, and output drive voltages V41, V42, V43, V44 to the group in the drive cycle T4 Drive lines Txg1-Txg4.

The inductive capacitors C1-C4 will also generate inductive capacitors in the four driving periods T1-T4 respectively. At this time, the sensing line Rx1 will respectively receive the total capacitance S _T1 , S _T2 , S _T3 , and S _T4 after summing up the inductive capacitances corresponding to the inductive capacitances C1-C16 generated in each driving cycle. At this time, since the driving unit 110 does not output the driving voltage to each group of driving lines of the group GP2-GP4, the sensing capacitors C5-C16 will not generate sensing capacitance, so the total capacitance at this time is the sensing capacitance C1-C4 Corresponding to the sum of the induced capacitances generated. That is, during the driving period T1, the total capacitance S _T1 received by the sensing line Rx1 is V11×C1+V12×C2+V13×C3+V14×C4. During the driving period T2, the total capacitance _ST2 received by the sensing line Rx1 is V21×C1+V22×C2+V23×C3+V24×C4. During the driving period T3, the total capacitance _ST3 received by the sensing line Rx1 is V31×C1+V32×C2+V33×C3+V34×C4. During the driving period T4, the total capacitance _ST4 received by the sensing line Rx1 is V41×C1+V42×C2+V43×C3+V44×C4.

The total capacitance S _T1 , S _T2 , S _T3 , and S _T4 are sorted out to obtain the Kramer calculation formula as follows:

$\left[\begin{array}{c}{\mathrm{<span\; class="notranslate">\; S</span>}}_{\mathrm{<span\; class="notranslate">\; T</span>}\mathrm{<span\; class="notranslate">\; 1</span>}}\\ {\mathrm{<span\; class="notranslate">\; S</span>}}_{\mathrm{<span\; class="notranslate">\; T</span>}\mathrm{<span\; class="notranslate">\; 2</span>}}\\ {\mathrm{<span\; class="notranslate">\; S</span>}}_{\mathrm{<span\; class="notranslate">\; T</span>}\mathrm{<span\; class="notranslate">\; 3</span>}}\\ {\mathrm{<span\; class="notranslate">\; S</span>}}_{\mathrm{<span\; class="notranslate">\; T</span>}\mathrm{<span\; class="notranslate">\; 4</span>}}\end{array}\right]<span\; class="notranslate">\; =</span>\left[\begin{array}{cccc}{\mathrm{<span\; class="notranslate">\; V</span>}}_{\mathrm{<span\; class="notranslate">\; 11</span>}}& {\mathrm{<span\; class="notranslate">\; V</span>}}_{\mathrm{<span\; class="notranslate">\; 12</span>}}& {\mathrm{<span\; class="notranslate">\; V</span>}}_{\mathrm{<span\; class="notranslate">\; 13</span>}}& {\mathrm{<span\; class="notranslate">\; V</span>}}_{\mathrm{<span\; class="notranslate">\; 14</span>}}\\ {\mathrm{<span\; class="notranslate">\; V</span>}}_{\mathrm{<span\; class="notranslate">\; twenty\; one</span>}}& {\mathrm{<span\; class="notranslate">\; V</span>}}_{\mathrm{<span\; class="notranslate">\; twenty\; two</span>}}& {\mathrm{<span\; class="notranslate">\; V</span>}}_{\mathrm{<span\; class="notranslate">\; twenty\; three</span>}}& {\mathrm{<span\; class="notranslate">\; V</span>}}_{\mathrm{<span\; class="notranslate">\; twenty\; four</span>}}\\ {\mathrm{<span\; class="notranslate">\; V</span>}}_{\mathrm{<span\; class="notranslate">\; 31</span>}}& {\mathrm{<span\; class="notranslate">\; V</span>}}_{\mathrm{<span\; class="notranslate">\; 32</span>}}& {\mathrm{<span\; class="notranslate">\; V</span>}}_{\mathrm{<span\; class="notranslate">\; 33</span>}}& {\mathrm{<span\; class="notranslate">\; V</span>}}_{\mathrm{<span\; class="notranslate">\; 34</span>}}\\ {\mathrm{<span\; class="notranslate">\; V</span>}}_{\mathrm{<span\; class="notranslate">\; 41</span>}}& {\mathrm{<span\; class="notranslate">\; V</span>}}_{\mathrm{<span\; class="notranslate">\; 42</span>}}& {\mathrm{<span\; class="notranslate">\; V</span>}}_{\mathrm{<span\; class="notranslate">\; 43</span>}}& {\mathrm{<span\; class="notranslate">\; V</span>}}_{\mathrm{<span\; class="notranslate">\; 44</span>}}\end{array}\right]\left[\begin{array}{c}{\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}\\ {\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}\\ {\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; 3</span>}}\\ {\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; 4</span>}}\end{array}\right]<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; det</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; V</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; \&NotEqual;</span>\mathrm{<span\; class="notranslate">\; 0</span>}$

Next, the demodulation unit 130 will calculate the inductive capacitance of the inductive capacitors C1-C4 on the sensing line Rx1 according to the above-mentioned Kramer calculation formula, that is, C1 is calculated by det(V1)/det(V), and C2 is calculated by det(V2)/det(V), C3 is calculated by det(V3)/det(V), and C4 is calculated by det(V4)/det(V). In the same driving period T1-T4, the demodulation unit 130 also calculates the inductive capacitances of the inductive capacitances corresponding to the group driving lines Txg1-Txg4 of the group GP1 on the sensing lines Rx2-Rx18 in the same manner. . After the demodulation unit 130 passes through the driving cycles T1-T4 (that is, the 1st to 4th driving cycles), it can calculate the value of each inductive capacitance at the intersection of the group driving lines Txg1-Txg4 and the sensing lines Rx1-Rx18 Inductive capacitance.

Similarly, after the demodulation unit 130 goes through 4 driving cycles (that is, the 5th to 8th driving cycles), it can calculate the inductive capacitance at the intersection of the group driving lines Txg5-Txg8 and the sensing lines Rx1-Rx18 Inductive capacitance. The demodulation unit 130 can also obtain the inductive capacitance of the inductive capacitance at the intersection of the group driving lines Txg9-Txg12 and the sensing lines Rx1-Rx18 after the 9th to 12th driving cycle, and the demodulation unit 130 After 13-16 driving cycles, the sensing capacitances of the sensing capacitors at the intersections of the group driving lines Txg13 - Txg16 and the sensing lines Rx1 - Rx18 are obtained. Therefore, it can be seen from the above that the demodulation unit 130 of this embodiment can obtain the sensing capacitance of each sensing capacitor disposed on the driving lines Tx1-Tx16 and the sensing lines Rx1-Rx18 after 16 driving cycles.

Please refer to FIG. 5 at the same time. When the user presses the touch position Tch on the touch surface 50 with a finger, the sensing capacitors C36, C37, C38, C46, The inductive capacitance of C47, C48, C56, C57, and C58 is changed when the finger touches the touch position Tch. In this embodiment, the sensing capacitance increases due to the finger touching the touch position Tch. At this time, the demodulation unit 130 will calculate the inductive capacitance of each inductive capacitor, and obtain the inductive capacitances of the inductive capacitors C36, C37, C38, C46, C47, C48, C56, C57, and C58 on the touch position Tch There is a change, and the sensing capacitances of the sensing capacitors other than the touch position Tch are not changed. Next, the demodulation unit 130 will transmit the touch position Tch to the back-end processing unit (such as the microcontroller (micro-controller, MCU) in the mobile phone) for analysis, so that the back-end processing unit can know that the user presses the touch position. Touch the touch position Tch of the surface 50, and further control the back-end electronic device (such as a mobile phone).

To sum up, in the touch sensing device and its operation method provided by the embodiments of the present invention, the driving unit 110 simultaneously drives a plurality of driving lines in a plurality of driving cycles, and the driving unit 110 respectively provides Driving voltages of different strengths and/or different phases are applied to the plurality of driving lines. The external noise that interferes with the sensing capacitor is dispersed to multiple sensing capacitors, thereby reducing the influence of external signals on a single sensing capacitor and improving the accuracy of the sensing capacitance of each sensing capacitor.

The above descriptions are only examples of the present invention, and are not intended to limit the patent scope of the present invention.

Claims (12)

1. a touch sensing device, is characterized in that, described touch sensing device comprises:

Multiple drive wire, is sequentially arranged abreast, and described drive wire is divided at least one group, and group described in each has is divided equally by described drive wire and the multiple groups drive wire formed;

Multiple sense wire, described sense wire and described drive wire are sequentially arranged across, drive wire described in each is corresponding with an infall of sense wire described in each is provided with an inductance capacitance, and the described drive wire that one end of described inductance capacitance electrical connection is corresponding, the described sense wire of the other end electrical connection correspondence of described inductance capacitance;

One driver element, be electrically connected described drive wire, described driver element drives the described group drive wire of same group according to the order of described group simultaneously and drive multiple drive cycle in same group, and a driving voltage of varying strength is supplied to described group drive wire respectively by described driver element in each drive cycle of same group, the quantity of wherein said group drive wire is identical with the quantity of described drive cycle;

One sensing cell, is electrically connected described sense wire, described sensing cell receive induced electricity capacity that described inductance capacitance corresponding to sense wire described in each produce add up after a total capacitance; And

One demodulating unit, be electrically connected described sensing cell, the described total capacitance that each drive cycle of the same group that described demodulating unit senses according to each sense wire produces and described driving voltage, with calculate respectively same group on sense wire described in each each described in the described induced electricity capacity of described inductance capacitance corresponding to group's drive wire.

2. touch sensing device according to claim 1, is characterized in that, described demodulating unit calculates the described induced electricity capacity of each inductance capacitance on sense wire described in each with one carat of agate arithmetic expression, and described carat agate arithmetic expression is:

Wherein, S _t1s _tnthe described total capacitance that the described inductance capacitance of the same group sensed for same sense wire produces at each drive cycle, [V ₁₁~ V _1n], [V ₂₁~ V _2n] ... [V _n1~ V _nn] for same group each described in drive cycle, described driver element is supplied to the described driving voltage of described group drive wire respectively, C ₁c _nthe described induced electricity capacity of the described group drive wire of the same group sensed for same sense wire.

3. touch sensing device according to claim 1, is characterized in that, in drive cycle described in each, described driving voltage is made up of identical multiple pulse voltages.

4. touch sensing device according to claim 1, it is characterized in that, described driver element drives the described group drive wire of same group according to the order of described group simultaneously and drive described drive cycle in same group, and the described driving voltage of out of phase is supplied to described group drive wire respectively by described driver element in each drive cycle of same group.

5. touch sensing device according to claim 1, it is characterized in that, described sensing cell comprises multiple AFE (analog front end) element and multiple Analog-digital Converter element, described in each, AFE (analog front end) element correspondence connects described sense wire, to receive described total capacitance respectively, and AFE (analog front end) element correspondence connects described Analog-digital Converter element described in each, to convert described total capacitance to digital signal pattern, and the described total capacitance of digital signal pattern is sent to described demodulating unit.

6. touch sensing device according to claim 1, it is characterized in that, described drive wire and described sense wire are arranged at a touching surface, when a user touches a touch position on described touching surface, described demodulating unit detects that the described induced electricity capacity of the described inductance capacitance that described touch position is corresponding changes, and described touch position is sent to a back-end processing unit and performs an analysis.

7. the How It Works of a touch sensing device, described touch sensing device comprises multiple drive wire and multiple sense wire, described drive wire is sequentially arranged abreast, described drive wire is divided at least one group, group described in each has is divided equally by described drive wire and the multiple groups drive wire formed, described sense wire and described drive wire are sequentially arranged across, drive wire described in each is corresponding with an infall of sense wire described in each is provided with an inductance capacitance, and the described drive wire that one end of described inductance capacitance electrical connection is corresponding, the described sense wire of the other end electrical connection correspondence of described inductance capacitance, it is characterized in that, the How It Works of described touch sensing device comprises the steps:

Drive the described group drive wire of same group according to the order of described group simultaneously and drive multiple drive cycle in same group, and respectively a driving voltage of varying strength is supplied to described group drive wire in each drive cycle of same group, the quantity of wherein said group drive wire is identical with the quantity of described drive cycle, and produces an induced electricity capacity respectively at the described inductance capacitance of correspondence;

A total capacitance after the described induced electricity capacity that the described inductance capacitance that sense wire described in each receives correspondence produces adds up; And

The described driving voltage of each drive cycle of the same group sensed according to sense wire described in each and described total capacitance, calculate respectively the same group on sense wire described in each each described in the described induced electricity capacity of described inductance capacitance corresponding to group's drive wire.

8. the How It Works of touch sensing device according to claim 7, is characterized in that, in calculate on each sense wire each described in the described induced electricity capacity of inductance capacitance time, calculated by one carat of agate arithmetic expression, described carat agate arithmetic expression is:

Wherein, S _t1s _tnthe described total capacitance that the described inductance capacitance of the same group sensed for same sense wire produces at each drive cycle, [V ₁₁~ V _1n], [V ₂₁~ V _2n] ... [V _n1~ V _nn] in each drive cycle of same group, be supplied to the described driving voltage of described group drive wire respectively, C ₁c _nthe described induced electricity capacity of the described group drive wire of the same group sensed for same sense wire.

9. the How It Works of touch sensing device according to claim 7, is characterized in that, in drive cycle described in each, described driving voltage is made up of identical multiple pulse voltages.

10. the How It Works of touch sensing device according to claim 7, is characterized in that, in each drive cycle of same group, respectively the described driving voltage of out of phase is supplied to described group drive wire.

The How It Works of 11. touch sensing devices according to claim 7, is characterized in that, described in each, sense wire also comprises step after receiving described total capacitance: convert described total capacitance to digital signal pattern.

The How It Works of 12. touch sensing devices according to claim 7, it is characterized in that, after the described induced electricity capacity of each inductance capacitance calculated on sense wire described in each, also comprise step: judge whether the described induced electricity capacity of each inductance capacitance changes, and the touch position corresponding to described inductance capacitance changed by described induced electricity capacity is sent to a back-end processing unit performs an analysis.